Vibration suppression device of heat transfer tube and steam generator

ABSTRACT

There is provided a vibration suppression device of a heat transfer tube including: a cord member that has flexibility and is disposed in a heat transfer tube; and a plurality of sleeves that are mounted outside the cord member with a predetermined first gap and are disposed on an inner face of the heat transfer tube with a predetermined second gap.

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012-142460 filed Jun. 25, 2012, the entire contents of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a vibration suppression device of heat transfer tubes for suppressing vibration of a plurality of heat transfer tubes used in a heat exchanger, and a steam generator to which a vibration suppression device of the heat transfer tubes is applied.

2. Description of the Related Art

A nuclear power plant includes a nuclear reactor, a steam generator, a steam turbine, an electric generator, and the like. For example, a pressurized water reactor (PWR) generates high-temperature and high-pressure water which is not boiled throughout a reactor core, using light water as a nuclear reactor coolant and a neutron moderator. The steam generator exchanges heat between the high-temperature and high-pressure water (the primary cooling water) and the secondary cooling water to generate steam. The steam turbine drives a turbine by this steam, and the electric generator generates electricity by this driving power.

In the steam generator, a hollow airtight body portion is provided therein with a tube bundle shroud at a predetermined distance with an inner wall face thereof, a plurality of reverse U-shaped heat transfer tubes are provided in the tube bundle shroud, end portions of the heat transfer tubes are supported by the tube plate, and thus an inlet side channel head and an outlet side channel head of the primary cooling water are formed at a lower end portion of a body portion. In addition, in the body portion, an inlet portion of the secondary cooling water is positioned and provided on the upside of the tube bundle shroud, a steam-water separator and a moisture separator are arranged up and down, and a steam outlet is provided on the upper side thereof.

Accordingly, the primary cooling water is supplied from the cooling water tube to the plurality of heat transfer tubes through the inlet side channel head, and the secondary cooling water is supplied from the inlet portion into the body portion. Then, since heat exchange is performed between the primary cooling water (hot water) flowing in the plurality of heat transfer tubes and the secondary cooling water (cold water) circulating in the body portion, the secondary cooling water absorbs the heat, and thus steam is generated. The water of the generated steam is removed by the steam-water separator, the steam from which the moisture thereof is removed by the moisture separator is discharged from the steam outlet, and the heat-exchanged primary cooling water is discharged from the outlet side channel head.

However, in the steam generator, high-pressure water as the primary cooling water is supplied into the plurality of heat transfer tubes, the external secondary cooling water is heated to generate steam, and thus the heat transfer tubes easily vibrate. In this case, the lower end portions of the heat transfer tubes are supported by the tube plate, and an upper U bend portion is supported by an anti-vibration bar inserted between the heat transfer tubes. However, the heat transfer tube may partially deteriorate due to the long use, abrasion occurs at a through-hole of a tube support plate or a contact portion with the anti-vibration bar, and thus the heat transfer tube may be thinned. When the heat transfer tube deteriorates or is thinned, a function thereof may be damaged. Accordingly, as unusable, a plug is fixed at each end portion of the heat transfer tubes to prevent the primary cooling water from flowing in, and a stabilizer (a wire or the like) is inserted therein to suppress vibration.

As such a technique, as a general vibration stabilizing method, there is a stabilizer including only one or a plurality of wires. In addition, for example, strengthening of a function is disclosed in Patent Documents as described below. In a heat exchange tube vibration stabilization method and device disclosed in Japanese Patent Application Laid-open No. 60-159595, a plurality of sleeves are fixed to cables at a predetermined distance in an axial direction, a leading end assembly is fixed to a leading end portion, to configure a tube plug attachment seal assembly, and the vibration stabilization device is inserted and fixed into the heat transfer tube, to stabilize the vibration of the deteriorating tube. In addition, an absorption method and device of vibration energy of a vibrating tube disclosed in Japanese Patent No. 2759090 are configured by connecting a cable end portion installation tool to a cable leading member through a plurality of cables, and the absorption device is inserted into a heat transfer tube, to absorb vibration energy of the tube.

However, even when a function is strengthened as well as a simple structure of only a wire, in the heat exchange tube vibration stabilization device described above, since the plurality of sleeves are fixed to the cables, the vibration stabilization device may integrally vibrate when the heat transfer tube vibrates, and thus it is difficult to sufficiently suppress the vibration of the heat transfer tube. In addition, in the absorption device of the vibration energy of the tube, the plurality of cables are merely disposed in the tubes. Even in this case, when the heat transfer tube vibrates, the cable may integrally vibrate, and thus it is difficult to sufficiently suppress the vibration of the heat transfer tube.

SUMMARY OF THE INVENTION

According to a first aspect of the present invention, there is provided a vibration suppression device of a heat transfer tube including: a cord member that has flexibility and is disposed in a heat transfer tube; and a plurality of sleeves that are mounted outside the cord member with a predetermined first gap and are disposed on an inner face of the heat transfer tube with a predetermined second gap.

According to a second aspect of the present invention, there is provided a steam generator, which is provided with the vibration suppression device of the heat transfer tube according to the first aspect, including: a body portion having a hollow airtight shape; a heat transfer tube group that is provided to form a reverse U-shape in the body portion and is formed of a plurality of heat transfer tubes in which first cooling water flows; a tube plate that is fixed to a lower portion in the body portion and supports end portions of the plurality of heat transfer tubes; an inlet side channel head and an outlet side channel head that are provided at a lower end portion of the body portion and communicate with each end portion of the plurality of heat transfer tubes; a water supply portion that supplies secondary cooling water into the body portion; and a steam outlet that is provided at an upper end portion of the body portion.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram illustrating a state where a vibration suppression device of a heat transfer tube according to a first embodiment of the invention is provided at a steam generator;

FIG. 2 is a front view of the vibration suppression device of the heat transfer tube of the first embodiment;

FIG. 3 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of the first embodiment;

FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 2 illustrating a cross section of a main component of the vibration suppression device;

FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 2 illustrating a cross section of a main component of the vibration suppression device;

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 2 illustrating a cross section of a main component of the vibration suppression device;

FIG. 7 is a schematic configuration diagram of a nuclear power plant to which a steam generator of the first embodiment is applied;

FIG. 8 is a schematic configuration diagram illustrating the steam generator of the first embodiment;

FIG. 9 is a front view of a vibration suppression device of a heat transfer tube according to a second embodiment of the invention;

FIG. 10 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of the second embodiment;

FIG. 11 is a front view of a vibration suppression device of a heat transfer tube according to a third embodiment of the invention;

FIG. 12 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of the third embodiment;

FIG. 13 is a front view of a vibration suppression device of a heat transfer tube according to a fourth embodiment of the invention;

FIG. 14 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of the fourth embodiment; and

FIG. 15 is a cross-sectional view of a main component of a vibration suppression device of a heat transfer tube according to a fifth embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention has been made to solve the above-described problem, and an object of the invention is to provide a vibration suppression device of a heat transfer tube, capable of appropriately suppressing vibration of the heat transfer tube, and a steam generator.

Hereinafter, a preferred embodiment of a vibration suppression device of a heat transfer tube and a steam generator according to the invention will be described in detail with reference to the accompanying drawings. In addition, the invention is not limited by the embodiment, and when there are a plurality of embodiments, the invention may include combination of the embodiments.

First Embodiment

FIG. 1 is a schematic diagram illustrating a state where a vibration suppression device of a heat transfer tube according to a first embodiment of the invention is provided at a steam generator, FIG. 2 is a front view of the vibration suppression device of the heat transfer tube of the first embodiment, FIG. 3 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of the first embodiment, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 2 illustrating a cross section of a main component of the vibration suppression device, FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 2 illustrating a cross section of a main component of the vibration suppression device, FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 2 illustrating a cross section of a main component of the vibration suppression device, FIG. 7 is a schematic configuration diagram of a nuclear power plant to which a steam generator of the first embodiment is applied, and FIG. 8 is a schematic configuration diagram illustrating the steam generator of the first embodiment.

A nuclear reactor of the first embodiment is a pressurized water reactor (PWR), in which light water is used as a nuclear reactor coolant and a neutron moderator and is prepared to be high-temperature and high-pressure water that is not boiled throughout a reactor internal portion, the high-temperature and the high temperature water is sent to the steam generator to generate steam by heat exchange, and the steam is sent to a turbine generator to generate electricity.

In a nuclear power plant having the pressurized water reactor of the first embodiment, as illustrated in FIG. 7, a containment 11 is provided therein with a pressurized water reactor 12 and a steam generator 13, the pressurized water reactor 12 and the steam generator 13 are connected to a high-temperature side supply tube 14 through a low-temperature side supply tube 15, the high-temperature side supply tube 14 is provided with a pressurizer 16, and the low-temperature side supply tube 15 is provided with a primary cooling water pump 17. In this case, using the light water as the moderator and the primary cooling water (coolant), in order to suppress boiling of the primary cooling water in the reactor internal portion, a primary cooling system controls to keep a high-pressure state of about 150 to 160 atmospheric pressure by the pressurizer 16.

Accordingly, in the pressurized water reactor 12, the light water as the primary cooling water is heated by low-enriched uranium or MOX as fuel (atom fuel), and the high-temperature primary cooling water kept at a predetermined high pressure by the pressurizer 16 is sent to the steam generator 13 through the high-temperature side supply tube 14. In the steam generator 13, heat exchange is performed between the high-temperature and high-pressure primary cooling water and the secondary cooling water, and the cooled primary cooling water returns to the pressurized water reactor 12 through the low-temperature side supply tube 15.

The steam generator 13 is connected to a steam turbine 32 through a tube 31 that supplies the heated secondary cooling water, that is, the steam, and the tube 31 is provided with a main steam isolation valve 33. The steam turbine 32 has a high-pressure turbine 34 and a low-pressure turbine 35, and is connected to an electric generator (power generating device) 36. In addition, a moisture isolation heating tube 37 is provided between the high-pressure turbine 34 and the low-pressure turbine 35, a cooling water branch tube 38 branched from the tube 31 is connected to the moisture isolation heating tube 37, the high-pressure turbine 34 and the moisture isolation heating tube 37 are connected through a low-temperature re-heating tube 39, and the moisture isolation heating tube 37 and the low-pressure turbine 35 are connected through a high-temperature re-heating tube 40.

In addition, the low-pressure turbine 35 of the steam turbine 32 has a condenser 41, the condenser 41 is connected to a turbine bypass tube 43 having a bypass valve 42 from the tube 31, and is connected to an intake tube 44 and a drain tube 45 that supply and discharge the cooling water (for example, seawater). The intake tube 44 has a circulation water pump 46, and the other end portion is disposed undersea with the drain tube 45.

The condenser 41 is connected to a tube 47, and is connected to a condenser pump 48, a grand condenser 49, a condensate demineralizer 50, a condensate booster pump 51, and a low-pressure feed water heater 52. In addition, the tube 47 is connected to a deaerator 53, and is provided with a main feed water pump 54, a high-pressure feed water heater 55, and a main feed water control valve 56.

Accordingly, in the steam generator 13, the steam generated by performing heat exchange with the high-temperature and high-pressure primary cooling water is sent to the steam turbine 32 (from the high-pressure turbine 34 to the low-pressure turbine 35) through the tube 31, and the steam turbine 32 is driven by the steam to generate electricity by the electric generator 36. In this case, after steam from the steam generator 13 drives the high-pressure turbine 34, the moisture included in the steam is removed and heated by the moisture isolation heating tube 37, and then the low-pressure turbine 35 is driven. The steam driving the steam turbine 32 is cooled using seawater by the condenser 41 to be a condensate, and returns to the steam generator 13 through the grand condenser 49, the condensate demineralizer 50, the low-pressure feed water heater 52, the deaerator 53, the high-pressure feed water heater 55, and the like.

In the steam generator 13 of the nuclear power plant configured as described above, as illustrated in FIG. 8, a body portion 61 has an airtight hollow cylinder shape, and a diameter of the upper portion is slightly smaller than that of the lower portion. The body portion 61 is provided thereunder with a tube bundle shroud 62 having a cylindrical shape with a predetermined gap from an inner wall face. The tube bundle shroud 62 is provided therein with a plurality of tube support plates 63 corresponding to a predetermined height position, a tube plate 64 is fixed to the lower portion of the tube support plate 63, and each tube support plate 63 is supported by a plurality of stay rods 65 provided extending upward from the tube plate 64. The tube bundle shroud 62 is provided therein with a heat transfer tube group 67 including a plurality of reverse U-shape heat transfer tubes 66.

In the heat transfer tube group 67, an upper portion of each heat transfer tube 66 is provided with a U bend portion 68 as the U-shape portion, a lower end portion thereof is expanded and supported by the tube plate 64, and an intermediate portion (a middle portion) is supported by the plurality of tube support plates 63. In the U bend portion 68, the plurality of heat transfer tubes are disposed to be substantially parallel to each other in an inner and outer direction (an up and down direction) of the tube bundle shroud 62, and are disposed to be substantially parallel to each other in a radial direction (a horizontal direction) of the tube bundle shroud 62. A plurality of anti-vibration bars 69 are interposed between the heat transfer tubes disposed in the radial direction of the tube bundle shroud 62.

In addition, the lower portion of the body portion 61 has a spherical shape, an inlet chamber 71 and an outlet chamber 72 are partitioned and formed under the tube plate 64 by a partition wall 70, an inlet nozzle 73 and an outlet nozzle 74 are formed, one end portion of each heat transfer tube 66 communicates with the inlet chamber 71, and the other end portion communicates with the outlet chamber 72.

In addition, the body portion 61 is provided with a steam-water separator 75 that separates the supply water into steam and hot water at the upper portion of the heat transfer tube group 67, and a moisture separator 76 that removes moisture of the separated steam to be a state close to dry steam. In addition, in the body portion 61, a feed water pipe 77 that supplies the secondary cooling water to the inside is connected between the heat transfer tube group 67 and the steam-water separator 75, and a steam outlet 78 is formed at the top portion. That is, the secondary cooling water supplied from the feed water pipe 77 to the inside flows down with the tube bundle shroud 62 and circulates at the upside of tube plate 64, and heat exchange with the hot water (the primary cooling water) flowing in each heat transfer tube 66 when the secondary cooling water rises in the heat transfer tube group 67.

Accordingly, as illustrated in FIG. 7 and FIG. 8, the primary cooling water heated in the pressurized water reactor 12 is sent to the inlet chamber 71 of the steam generator 13 through the high-temperature side supply tube 14, passes and circulates through the inside of the plurality of heat transfer tubes 66, and reaches the outlet chamber 72. Meanwhile, the secondary cooling water cooled by the condenser 41 is sent to the feed water pipe 77 of the steam generator 13 through the tube 47, and performs heat exchange with the hot water (the primary cooling water) passing through the body portion 61 and flowing in the heat transfer tube 66. That is, in the body portion 61, heat exchange is performed between the high-pressure and high-temperature primary cooling water and the secondary cooling water, and the cooled primary cooling water returns from the outlet chamber 72 to the pressurized water reactor 12 through the cooling water tube 15. Meanwhile, the secondary cooling water subjected to the heat exchange with the high-pressure and high-temperature primary cooling water rises in the body portion 61, and is separated into steam and hot water by the steam-water separator 75, moisture of the steam is removed by the moisture separator 76, and the steam is sent from the steam outlet 78 to the steam turbine 32 through the tube 31.

In the steam generator 13 configured as described above, as illustrated in FIG. 1, the high-pressure water as the primary cooling water flows in the plurality of heat transfer tubes 66, and the secondary cooling water flowing in the body portion 61 is heated to generate the steam, so that the plurality of heat transfer tubes 66 easily vibrate. Although the lower end portion of the heat transfer tube 66 is supported by the tube plate 64, and the U bend portion 68 is supported by the anti-vibration bar 69, vibration may occur. For this reason, in the heat transfer tube 66, abrasion may occur at a contact portion with the through-hole of the tube support plate 63 or the anti-vibration bar 69 due to long-period use. In this case, since a function of the heat transfer tube 66 may be disabled, the heat transfer tube 66 is made unusable, a plug is mounted on each end portion of the heat transfer tube 66 to prevent the primary cooling water from flowing in, and an anti-vibration member is inserted therein to suppress the vibration.

A vibration suppression device 100 of the heat transfer tube of the first embodiment is provided in the unusable heat transfer tube 66 in the steam generator 13, the end portion of the heat transfer tube 66 is closed by a plug 108 to prevent the primary cooling water from flowing in, and the vibration of the heat transfer tube 66 closed by the plug 108, particularly, the U bend portion 68, is suppressed.

As illustrated in FIG. 2 to FIG. 6, the vibration suppression device 100 has a wire (a cord member) 101 having flexibility and disposed in the heat transfer tube 66, and a plurality of sleeves 102 and 103 provided on the outside of the wire 101 with a predetermined first gap S1 and disposed on an inner face of the heat transfer tube 66 with predetermined second gaps S2 a and S2 b. A leading end portion of the wire 101 is connected to a hook (a towing portion) 104, and a trailing end portion thereof is connected to an end portion clasp 105 combinable with the plug (a closure member) 108 closing the end portion of the heat transfer tube 66.

The wire 101 is made of stainless steel, an outer diameter thereof is smaller than an inner diameter of the heat transfer tube 66, and a length thereof is shorter than a length of the heat transfer tube 66. The leading end portion of the wire 101 is inserted into a connection portion 111 by a predetermined length such that the hook 104 is connected by welding. An outer diameter of the hook 104 is smaller than an inner diameter of the heat transfer tube 66, the hook 104 can be inserted into the heat transfer tube 66, a connection hole 112 is formed at the end portion thereof, and the hook 104 is connectable to the end portion of a towing wire 107 to be described below.

In addition, the trailing end portion of the wire 101 is inserted into a connection portion 113 by a predetermined length such that the end portion clasp 105 is connected by welding. An outer diameter of the end portion clasp 105 is slightly smaller than the inner diameter of the heat transfer tube 66, and can be inserted into the heat transfer tube 66, a screw portion is provided at the end portion, and the plug 108 having the same screw portion is connectable.

The sleeves 102 and 103 are the first sleeve 102 and the second sleeve 103 with different outer diameters. The first sleeve 102 has a spherical outer face, and the second sleeve 103 has a cylindrical outer face, and the outer diameter of the first sleeve 102 is set larger than the outer diameter of the second sleeve 103. In this case, the outer diameters of the first sleeve 102 and the second sleeve 103 are different, but the lengths thereof are substantially the same, and weight of the first sleeve 102 is set larger than weight of the second sleeve 103.

That is, the first sleeve 102 has a cylindrical shape, and is provided with an insertion hole 121 through which the wire 101 is inserted and passes, and the first gap S1 is formed between the outer circumferential face of the wire 101 and the inner circumferential face of the insertion hole 121. In addition, the first sleeve 102 has a spherical outer face, and the second gap S2 a is formed between the inner circumferential face of the heat transfer tube 66 and the outer face of the first sleeve 102. Meanwhile, the second sleeve 103 has a cylindrical shape, and is provided with an insertion hole 122 through which the wire 101 is inserted and passes, and the first gap S1 is formed between the outer circumferential face of the wire 101 and the inner circumferential face of the insertion hole 122. In addition, the second sleeve 103 has a circular outer face, the second gap S2 b is formed between the inner circumferential face of the heat transfer tube 66 and the outer face of the second sleeve 103.

In the wire 101, a fixing sleeve (a positioning member) 123 is fixed at a position separated from the hook 104 at a predetermined distance, for example, by calking, and a fixing sleeve (a positioning member) 124 is fixed at a position separated from the end portion clasp 105 at a predetermined distance, for example, by calking. The fixing sleeves 123 and 124 have a cylindrical shape, and are provided with insertion holes 125 and 126 through which the wire 101 is inserted and passes, and the outer circumferential face of the wire 101 and the inner circumferential faces of the insertion holes 125 and 126 come in close contact with each other. In addition, the fixing sleeves 123 and 124 have a circular outer face, and the second gap S2 c is formed between the inner circumferential face of the heat transfer tube 66 and the outer circumferential faces of the fixing sleeves 123 and 124.

A predetermined number of first sleeves 102 and second sleeves 103 are alternately disposed between the pair of positioning members 123 and 124. In the first embodiment, three second sleeves 103 are disposed adjacent to the fixing sleeve 123, three first sleeves 102 are disposed adjacent to the second sleeves 103, and four second sleeves 103 are disposed adjacent to the first sleeves 102. Then, three first sleeves 102 and four second sleeves 103 are alternately disposed. That is, four second sleeves 103 are disposed between the first sleeves 102.

In addition, in the vibration suppression device 100 of the first embodiment, the first sleeve 102 and the second sleeve 103 with different outer diameters may be alternately disposed in the longitudinal direction of the wire 101, the number of first sleeves 102 or second sleeves 103 is not limited to the above description, the first sleeve 102 and the second sleeve 103 may be alternately disposed one by one, and one sleeve on one side and a plurality of the other sleeves may be alternately disposed.

In addition, the vibration suppression device 100 is formed in a linear shape in FIG. 2 and FIG. 3, it is described that the plurality of sleeves 102 and 103 are closely disposed between two fixing sleeves 123 and 124, but the minimum gap is secured between the plurality of sleeves 102 and 103. That is, the heat transfer tube 66 has the U bend portion 68, and in the vibration suppression device 100, a part of sleeves 102 and 103 is disposed at the U bend portion 68. For this reason, when the vibration suppression device 100 is inserted into the heat transfer tube 66 and a part of sleeves 102 and 103 is moved and disposed up to the U bend portion 68, the gap is formed between the plurality of sleeves 102 and 103 such that at least the vibration suppression device 100 can be curved along the U bend portion 68.

As illustrated in FIG. 1, in the vibration suppression device 100 configured as described above, the hook 104 is connected to one end portion of the towing wire 107. A worker inserts the other end portion of the towing wire 107 into one end portion 66 a of the heat transfer tube 66 in the inlet chamber 71 of the body portion 61, and is moved to the other end portion 66 b of the heat transfer tube 66 through the U bend portion 68. The worker extracts the other end portion of the towing wire 107 from the other end portion 66 b of the heat transfer tube 66 in the outlet chamber 72 of the body portion 61. By this work, the vibration suppression device 100 is towed by the towing wire 107, is inserted from one end portion 66 a of the heat transfer tube 66, and can moved up to the U bend portion 68.

When the end portion clasp 105 of the vibration suppression device 100 is inserted into one end portion 66 a of the heat transfer tube 66 at the inlet chamber 71 of the body portion 61, the worker fixes and closes the plug 108 connected to the end portion clasp 105 to one end portion 66 a of the heat transfer tube 66 by a diameter expansion work. In addition, at the outlet chamber 72 of the body portion 61, the worker cuts the towing wire 107 to be separated from the hook 104 of the vibration suppression device 100, inserts a plug 106 having substantially the same configuration as the plug 108 into the other end portion 66 b of the heat transfer tube 66, and fixes and closes the plug 106 by the diameter expansion work. In addition, the towing wire 107 is cut and detached from the hook 104, but then a weight is connected to the cut end of the towing wire 107 or the cut end of the towing wire 107 is connected to the plug 106, and thus stabilization in disposition of the vibration suppression device 100 may be achieved.

The end portions 66 a and 66 b of the unused heat transfer tube 66 are closed by plugs 108 and 106, the vibration suppression device 100 is disposed therein, particularly, in the U bend portion 68, and thus it is possible to suppress the vibration of the heat transfer tube 66. That is, when the U bend portion 68 of the heat transfer tube 66 vibrates in an in-plane direction (the left and right direction and the up and down direction in FIG. 1), the wire 101 and the sleeves 102 and 103 relatively move in the radial direction of the heat transfer tube 66, and the wire 101, the sleeves 102 and 103, and the heat transfer tube 66 interfere with each other. For this reason, the vibration energy of the heat transfer tube 66 is dissipated by the vibration energy of the wire 101 and the sleeves 102 and 103, that is, the heat transfer tube 66, the wire 101, and the sleeves 102 and 103 move in directions different from each other, the vibration energy of the heat transfer tube 66 and the vibration energy of the wire 101 and the sleeves 102 and 103 are canceled with each other, and the vibration of the heat transfer tube 66 is absorbed and suppressed.

Particularly, since the first sleeve 102 and the second sleeve 103 have the diameters different from each other, the first sleeve 102 moves relatively with respect to the heat transfer tube 66 as much as the second gap S2 a when the heat transfer tube 66 vibrates in the in-plane direction, but the second sleeve 103 further moves relatively with respect to the heat transfer tube 66 as much as the second gap S2 b from the position where the first sleeve 102 comes in contact with the inner face of the heat transfer tube 66. For this reason, with respect to the movement (vibration) of the heat transfer tube 66, the sleeves 102 and 103, particularly, the second sleeve 103 moves (vibrates) in the reverse direction, it is possible to efficiently dissipate the vibration energy of the heat transfer tube 66. In addition, since the first sleeve 102 and the second sleeve 103 have weights different from each other, unbalance in weight occurs between the first sleeve 102 and the second sleeve 103 when the heat transfer tube 66 vibrates in the in-plane direction, the sleeves 102 and 103 randomly vibrate with respect to the vibration of the heat transfer tube 66, and it is possible to efficiently dissipate the vibration energy of the heat transfer tube 66.

The vibration suppression device of the heat transfer tube of the first embodiment as described above is provided with the wire 101 that has flexibility and is disposed in the heat transfer tube 66, and the plurality of sleeves 102 and 103 that are provided at the outer circumferential portion of the wire 101 with the predetermined first gap S1 and are disposed on the inner circumferential face of the heat transfer tube 66 with the predetermined second gaps S2 a and S2 b.

Accordingly, the sleeves 102 and 103 are separated from the wire 101 by the first gap S1, and is separated from the heat transfer tube 66 by the second gaps S2 a and S2 b, and the heat transfer tube 66, the wire 101, and the sleeves 102 and 103 are movable relatively with respect to the heat transfer tube 66 in the radial direction. For this reason, when the heat transfer tube 66 vibrates, the wire 101 and the sleeves 102 and 103 relatively move in the radial direction of the heat transfer tube 66, the wire 101, the sleeves 102 and 103, and the heat transfer tube 66 interfere with one another, the vibration energy of the heat transfer tube 66 is dissipated by the vibration energy of the wire 101 and the sleeves 102 and 103, and it is possible to effectively absorb and suppress the vibration of the heat transfer tube 66.

In the vibration suppression device of the heat transfer tube of the first embodiment, the first sleeve 102 has the spherical outer face. Accordingly, when the first sleeve 102 is inserted into the heat transfer tube 66 with the wire 101, it is possible to easily insert the plurality of first sleeves 102 also to the U bend portion 68 of the heat transfer tube 66, the plurality of first sleeves 102 are appropriately inserted irrespective of the shape of the heat transfer tube 66, and it is possible to improve workability. In addition, it is possible to form the first sleeve 102 only by processing the through-hole (the insertion hole 121) with respect to a spherical body, and thus it is possible to reduce a production cost.

In the vibration suppression device of the heat transfer tube of the first embodiment, the first sleeve 102 and the second sleeve 103 with different diameters are provided. Accordingly, when the heat transfer tube 66 vibrates, the first sleeve 102 with the larger diameter moves relatively with respect to the heat transfer tube 66, and the second sleeve 103 with the smaller diameter further moves relatively with respect to the heat transfer tube 66 from the position where the first sleeve 102 comes in contact with the inner face of the heat transfer tube 66. For this reason, the second sleeve 103 drastically vibrates in the reverse direction with respect to the vibration of the heat transfer tube 66, and thus it is possible to effectively dissipate the vibration energy of the heat transfer tube 66.

In the vibration suppression device of the heat transfer tube of the first embodiment, the first sleeve 102 has the spherical outer face, the second sleeve 103 has the circular outer face, and the outer diameter of the first sleeve 102 is set larger than the outer diameter of the second sleeve 103. Accordingly, when the heat transfer tube 66 vibrates, the first sleeve 102 moves and comes in contact with the inner face of the heat transfer tube 66, then the second sleeve 103 can move, and thus it is possible to efficiently suppress the vibration of the heat transfer tube 66.

In the vibration suppression device of the heat transfer tube of the first embodiment, the plurality of second sleeves 103 are disposed between the plurality of first sleeves 102. Accordingly, with respect to the vibration of the heat transfer tube 66, it is possible to efficiently and relatively move the first sleeves 102 and the second sleeves 103.

In the vibration suppression device of the heat transfer tube of the first embodiment, the leading end of the wire 101 is connected to the hook 104, and the trailing end is connected to the end portion clasp 105 that closes the end portion 66 a of the heat transfer tube 66. Accordingly, by connecting the towing wire 107 of the hook 104, it is possible to easily dispose the plurality of sleeves 102 and 103 at a predetermined position in the heat transfer tube 66 through the wire 101, it is possible to easily close the end portion 66 a of the heat transfer tube 66 by the plug 108 connected to the end portion clasp 105, and thus it is possible to improve workability.

In the vibration suppression device of the heat transfer tube of the first embodiment, the plurality of sleeves 102 and 103 are disposed at the U bend portion 68 in the heat transfer tube 66. Accordingly, even when the heat transfer tube 66 disposed at the U bend portion 68 vibrates in the in-plane direction, the plurality of sleeves 102 and 103 relatively moves, and thus it is possible to appropriately suppress the vibration of the heat transfer tube 66.

In the vibration suppression device of the heat transfer tube of the first embodiment, the pair of fixing sleeves 123 and 124 are fixed to the wire 101, and a predetermined number of first sleeves 102 and second sleeves 103 are alternately disposed between the pair of positioning members 123 and 124. Accordingly, it is possible to dispose the first sleeve 102 and the second sleeve 103 at a predetermined position of the wire 101, and it is possible to appropriately dispose the sleeves 102 and 103 at the position where vibration easily occurs in the heat transfer tube 66.

In addition, the steam generator of the first embodiment is provided with the body portion 61, the heat transfer tube group 67 that includes the U bend portion 68 and is formed of the plurality of heat transfer tubes 66 which are disposed in the body portion 61 and in which the primary cooling water flows, the tube plate 64 that is fixed to the lower portion in the body portion 61 and supports the end portion of the plurality of heat transfer tubes 66, and the plurality of tube support plates 63 that are fixed to the middle portion in the body portion 61 to support the middle portion of the plurality of heat transfer tubes 66, and the vibration suppression device 100 of the heat transfer tube described above.

Accordingly, the high-pressure water as the primary cooling water flows in the plurality of heat transfer tubes 66, and the heat transfer tubes 66 easily vibrate when the secondary cooling water flowing in the body portion 61 is heated to generate steam. In this case, when the heat transfer tube 66 vibrates, the sleeves 102 and 103 move relatively with respect to the heat transfer tube 66, the vibration energy of the heat transfer tube 66 is dissipated by the vibration energy of the sleeves 102 and 103, and thus it is possible to effectively absorb and suppress the vibration of the heat transfer tube 66.

Second Embodiment

FIG. 9 is a front view of a vibration suppression device of a heat transfer tube according to a second embodiment of the invention, and FIG. 10 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of the second embodiment. In addition, the members having the same function as that of the first embodiment described above are denoted by the same reference numerals, and the detailed description thereof is not repeated.

In the second embodiment, as illustrated in FIG. 9 and FIG. 10, a vibration suppression device 200 of a heat transfer tube is mounted on an unusable heat transfer tube 66 in a steam generator 13 (see FIG. 8), and is to suppress vibration of a heat transfer tube 66 in which an end portion is closed at the plug 108 and inflow of the primary cooling water is obstructed, particularly, a U bend portion 68.

The vibration suppression device 200 includes a wire 101 that is disposed in the flexible heat transfer tube 66, and a plurality of sleeves 102 that are mounted outside the wire 101 with a predetermined first gap S1 and is disposed on an inner face of the heat transfer tube 66 with a predetermined second gap S2 a. A leading end portion of the wire 101 is connected to a hook 104, and a trailing end portion thereof is connected to an end portion clasp 105 combinable with the plug 108 closing the end portion of the heat transfer tube 66.

The sleeve 102 has the same configuration as that of the first sleeve 102 (see FIG. 2), and an outer face thereof has a spherical shape. That is, the sleeve 102 has a cylindrical shape, and is provided with an insertion hole 121 through which the wire 101 is inserted and passes, and the first gap S1 is formed between the outer circumferential face of the wire 101 and the inner circumferential face of the insertion hole 121. In addition, the sleeve 102 has a spherical outer face, and the second gap S2 a is formed between the inner circumferential face of the heat transfer tube 66 and the outer face of the sleeve 102.

The wire 101 is separated from the hook 104 at a predetermined distance, and a plurality of sleeve assemblies 201 are disposed with a predetermined distance L in an area separated from the end portion clasp 105 at a predetermined distance. The sleeve assemblies 201 have the same configuration, a pair of fixing sleeves (positioning members) 202 and 203 are fixed to the wire 101 at a predetermined distance, and a plurality of (in the embodiment, three) sleeves 102 are movably disposed between the pair of fixing sleeves 202 and 203.

That is, the pair of fixing sleeves 202 and 203 have the cylindrical shape, is provided with insertion holes 204 and 205 through which the wire 101 is inserted and passes, the outer circumferential face of the wire 101 and the inner circumferential faces of the insertion holes 204 and 205 come in close contact with each other, and are fixed to the wire 101 by, for example, calking. The fixing sleeves 202 and 203 have a circular outer face, and the second gap S2 c is formed between the sleeve and the inner circumferential face of the heat transfer tube 66.

Three sleeves 102 are disposed between the pair of positioning members 202 and 203, and a predetermined third gap S3 is formed between the positioning members 202 and 203 and each sleeve 102, and between the sleeves 102. That is, three sleeves 102 are movably provided along the longitudinal direction of the wire 101 by the distance of the third gap S3 between the pair of positioning members 202 and 203 fixed to the wire 101.

In the vibration suppression device 200 of the second embodiment, the plurality of sleeves 102 are movable in the radial direction and the longitudinal direction (the axial core direction) of the heat transfer tube 66, with respect to the wire 101.

In addition, in this case, the number of sleeve assemblies 201 provided on the wire 101 and the number of sleeves 102 disposed between the pair of positioning members 202 and 203 are not limited to the above description.

The vibration suppression device 200 is disposed in the unused heat transfer tube 66 in the steam generator 13 in the same manner as that of the first embodiment described above, and thus it is possible to suppress the vibration of the heat transfer tube 66. That is, when the heat transfer tube 66 vibrates, the wire 101 and the sleeves 102 relatively move in the radial direction of the heat transfer tube 66, the sleeves 102 relatively move in the longitudinal direction of the heat transfer tube 66, and the wire 101, the sleeves 102, and the heat transfer tube 66 interfere with one another. For this reason, the vibration energy of the heat transfer tube 66 is dissipated by the vibration energy of the wire 101 or the sleeves 102, particularly, the heat transfer tube 66 and the sleeves 102 move in the reverse direction, the vibration energy of the heat transfer tube 66 and the vibration energy of the sleeves 102 are canceled with each other, and the vibration of the heat transfer tube 66 is absorbed and suppressed.

The vibration suppression device of the heat transfer tube of the second embodiment as described above is provided with the wire 101 that has flexibility and is disposed in the heat transfer tube 66, and the plurality of sleeves 102 that are mounted on the outer circumferential portion of the wire 101 with the predetermined first gap S1 and is disposed on the inner circumferential face of the heat transfer tube 66 with the predetermined second gap S2 a to be movable in the longitudinal direction of the wire 101.

Accordingly, the sleeves 102 are movable with respect to the wire 101 in the radial direction and the longitudinal direction of the heat transfer tube 66, the sleeves 102 relatively move in the radial direction and the longitudinal direction of the heat transfer tube 66 when the heat transfer tube 66 vibrates, the sleeves 102 and the heat transfer tube 66 interfere with each other, the vibration energy of the heat transfer tube 66 is dissipated by the vibration energy of the sleeves 102, and thus it is possible to appropriately and effectively absorb and suppress the vibration of the heat transfer tube 66.

In the vibration suppression device of the heat transfer tube of the second embodiment, the pair of fixing sleeves 202 and 203 are fixed to the wire 101 with a predetermined gap, and the sleeves 102 are movably disposed between the positioning members 202 and 203. Accordingly, a movement range of the sleeve 102 is specified by the pair of fixing sleeves 202 and 203, it is possible to specify the position of the sleeve 102 with respect to the heat transfer tube 66, and thus it is possible to effectively dispose the sleeve 102 in the vibration range of the heat transfer tube 66.

In the vibration suppression device of the heat transfer tube of the second embodiment, a predetermined third gap S3 is provided between the fixing sleeves 202 and 203 and sleeve 102 or between the plurality of sleeves 102. Accordingly, the sleeve 102 is movable relatively with respect to the heat transfer tube 66 in the axial core direction by the distance of the third gap S3, the sleeve 102 moves relatively with respect to the heat transfer tube 66 by the distance of the third gap when the heat transfer tube 66 vibrates, and thus it is possible to effectively absorb and suppress the vibration of the heat transfer tube 66.

In the vibration suppression device of the heat transfer tube of the second embodiment, the plurality of sleeves assemblies 201 are disposed with a predetermined distance L, in a predetermined area of the wire 101. Accordingly, with respect to the vibration of the heat transfer tube 66, the sleeves assemblies 201 can individually vibrate, and the sleeves 102 of the sleeve assemblies 201 relatively move, and thus it is possible to suppress the vibration. In addition, the wire 101 having flexibility is freely movable between the sleeve assemblies 201, it is possible to easily insert the vibration suppression device 200 into the heat transfer tube 66, and thus it is possible to improve workability.

Third Embodiment

FIG. 11 is a front view of a vibration suppression device of a heat transfer tube according to a third embodiment of the invention, and FIG. 12 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of the third embodiment. In addition, the members having the same function as that of the second embodiment described above are denoted by the same reference numerals, and the detailed description thereof is not repeated.

In the third embodiment, as illustrated in FIG. 11 and FIG. 12, a vibration suppression device 300 of a heat transfer tube is mounted on an unusable heat transfer tube 66 in a steam generator 13 (see FIG. 8), and is to suppress vibration of a heat transfer tube 66 in which an end portion is closed at the plug 108 and inflow of the primary cooling water is obstructed, particularly, a U bend portion 68.

The vibration suppression device 300 includes a wire 101 that is disposed in the flexible heat transfer tube 66, and a plurality of sleeves 102 that are mounted outside the wire 101 with a predetermined first gap S1 and is disposed on an inner face of the heat transfer tube 66 with a predetermined second gap S2 a. A leading end portion of the wire 101 is connected to a hook 104, and a trailing end portion thereof is connected to an end portion clasp 105 combinable with the plug closing the end portion of the heat transfer tube 66.

The wire 101 is separated from the hook 104 at a predetermined distance, and a plurality of sleeve assemblies 301 are disposed with a predetermined distance L in an area separated from the end portion clasp 105 by a predetermined distance. The sleeve assemblies 301 have the same configuration, a pair of fixing sleeves 202 and 203 are fixed to the wire 101 spaced by a predetermined distance, two sleeves 102 are movably disposed between the pair of fixing sleeves 202 and 203, and a coil spring (a biasing member) 302 is interposed between the sleeves 102.

That is, two sleeves 102 are disposed between the pair of positioning members 202 and 203, the coil spring 302 is disposed between two sleeves 102, and a predetermined third gap S3 is formed between the positioning members 202 and 203 and the sleeves 102 and between the sleeves 102. That is, two sleeves 102 and the coil spring 302 are movably provided between the pair of positioning members 202 and 203 fixed to the wire 101 along the longitudinal direction of the wire 101 by the distance of the third gap S3.

In the vibration suppression device 200 of the third embodiment, with respect to the wire 101, the plurality of sleeves 102 are movable in the radial direction and the longitudinal direction (the axial core direction) of the heat transfer tube 66.

In addition, in this case, the number of sleeve assemblies 301 provided on the wire 101 and the number of sleeves 102 disposed between the pair of positioning members 202 and 203 are not limited to the above description. In addition, the coil spring 302 is disposed between two sleeves 102, but the coil spring 302 may be disposed between the fixing sleeves 202 and 203 and the sleeves 102, and the coil spring 302 may be disposed on both sides between two sleeves 102 and between the fixing sleeves 202 and 203 and the sleeves 102.

The vibration suppression device 300 is disposed in the unused heat transfer tube 66 in the steam generator 13 in the same manner as the second embodiment described above, and thus it is possible to suppress the vibration of the heat transfer tube 66. That is, when the heat transfer tube 66 vibrates, the sleeves 102 relatively moves in the radial direction of the heat transfer tube 66 and moves in the longitudinal direction, the sleeves 102 and the heat transfer tube 66 interfere with each other. In this case, when the sleeves 102 move in the longitudinal direction of the heat transfer tube 66 between two fixing sleeves 202 and 203, the sleeves 102 are amplified by elastic force of the coil spring 302 and move. For this reason, the vibration energy of the heat transfer tube 66 is effectively dissipated by the vibration energy of the sleeves 102, that is, the heat transfer tube 66 and the sleeves 102 move in the reverse direction, the vibration energy of the heat transfer tube 66 and the vibration energy of the sleeves 102 are canceled with each other, and the vibration of the heat transfer tube 66 is absorbed and suppressed.

In the vibration suppression device of the heat transfer tube of the third embodiment as described above, the plurality of sleeve assemblies 301 are disposed in the predetermined area of the wire 101 with the predetermined distance L, the pair of fixing sleeves 202 and 203 are fixed to the wire 101 with the predetermined gap in the sleeve assemblies 201, the plurality of sleeves 102 are movably disposed between the positioning members 202 and 203, and the coil spring 302 is interposed between the sleeves 102.

Accordingly, when the heat transfer tube 66 vibrates, the sleeves 102 relatively move in the radial direction and the longitudinal direction of the heat transfer tube 66. In this case, each sleeve 102 is amplified by the elastic force of the coil spring 302 at the time of moving, the movement is promoted, the vibration energy of the heat transfer tube 66 is effectively dissipated by the vibration energy of the sleeve 102, and thus it is possible to appropriately absorb and suppress the vibration of the heat transfer tube 66.

In addition, in the third embodiment, the coil spring 302 is applied as the biasing member, but the invention is not limited thereto, and any one of a leaf spring, a rubber member, a synthetic resin, and an air spring may be applied.

Fourth Embodiment

FIG. 13 is a front view of a vibration suppression device of a heat transfer tube according to a fourth embodiment of the invention, and FIG. 14 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of the fourth embodiment. In addition, the same reference numerals and signs are given to the members having the same function as that of the embodiment described above, and the detailed description thereof will not be repeated.

In the fourth embodiment, as illustrated in FIGS. 13 and 14, a vibration suppression device 400 of a heat transfer tube is provided in an unusable heat transfer tube 66 in a steam generator 13 (see FIG. 8), and is to suppress vibration of a heat transfer tube 66 in which an end portion is closed at the plug 108 and inflow of the primary cooling water is obstructed, particularly, a U bend portion 68.

The vibration suppression device 400 has a wire 101 that has flexibility and is disposed in the heat transfer tube 66, an inner sleeve 404 provided outside the wire 101 with a predetermined first gap S1, and an outer sleeve 405 provided outside the inner sleeve 404 with a predetermined fourth gap S4 and is disposed on an inner face of the heat transfer tube 66 with a second gap S2 d. A leading end portion of the wire 101 is connected to a hook 104, and a trailing end portion thereof is connected to an end portion clasp 105 combinable with the plug closing the end portion of the heat transfer tube 66.

The wire 101 is separated from the hook 104 at a predetermined distance, and a plurality of assemblies 401 are disposed with a predetermined distance L in an area separated from the end portion clasp 105 at a predetermined distance. The sleeve assemblies 401 have the same configuration, a pair of fixing sleeves (positioning members) 402 and 403 are fixed to the wire 101 at a predetermined distance, and a plurality of (in the embodiment, two) sleeves 404 and 405 are movably disposed between the pair of fixing sleeves 402 and 403.

That is, the pair of fixing sleeves 402 and 403 have the cylindrical shape, is provided with insertion holes 411 and 412 through which the wire 101 is inserted and passes, the outer circumferential face of the wire 101 and the inner faces of the insertion holes 411 and 412 come in close contact with each other, and are fixed to the wire 101 by, for example, calking. In addition, the fixing sleeves 402 and 403 are integrally provided with flanges 413 and 414 at opposed end portions, the flanges 413 and 414 have a circular outer face, and the second gap S2 c is formed between the sleeve and the inner circumferential face of the heat transfer tube 66.

Two sleeves 404 and 405 are disposed between the pair of positioning members 402 and 403, a predetermined third gap S3 a is formed between the positioning members 402 and 403 and the inner sleeve 404, and a predetermined third gap S3 b is formed between the positioning members 402 and 403 and the outer sleeve 405. In this case, a length of the inner sleeve 404 in an axial core direction (a longitudinal direction of the wire 101) is set larger than a length of the outer sleeve 405 in the axial core direction, the inner sleeve 404 is movably provided along the longitudinal direction of the wire 101 as much as the distance of the third gap S3 a between the pair of positioning members 402 and 403 fixed to the wire 101, and the outer sleeve 405 is movably provided along the longitudinal direction of the wire 101 as much as the distance of the third gap S3 b between the pair of positioning members 402 and 403 fixed to the wire 101.

In addition, the inner sleeve 404 has a cylindrical shape, and is provided with an insertion hole 421 through which the wire 101 is inserted and passes, and the first gap S1 is formed between the outer circumferential face of the wire 101 and the inner circumferential face of the insertion hole 421. The outer sleeve 405 has a cylindrical shape, and is provided with an insertion hole 422 through which the inner sleeve 404 is inserted and passes, and the fourth gap S4 is formed between the outer circumferential face of the outer sleeve 405 and the inner circumferential face of the insertion hole 422. In addition, the outer sleeve 405 has a cylindrical shape, and the second gap S2 d is provided between the inner circumferential face and outer face of the heat transfer tube 66.

In the vibration suppression device 400 of the fourth embodiment, with respect to the wire 101, the inner and outer sleeves 404 and 405 are movable in the radial direction and the longitudinal direction (the axial core direction) of the heat transfer tube 66.

In addition, in this case, the number of sleeve assemblies 401 provided on the wire 101 and the number of sleeves 404 and 405 disposed between the pair of positioning members 402 and 403 are not limited to the above description. For example, a plurality of sets of the inner and outer sleeves 404 and 405 may be provided in the longitudinal direction of the wire 101, and the number of sleeves 404 and 405 overlapped with the outside of the wire 101 may be three or more.

The vibration suppression device 400 is disposed in the unused heat transfer tube 66 in the steam generator 13 in the same manner as the first embodiment described above, and thus it is possible to suppress the vibration of the heat transfer tube 66. That is, when the heat transfer tube 66 vibrates, the sleeves 404 and 405 relatively moves in the radial direction of the heat transfer tube 66 and moves in the longitudinal direction, the sleeves 404 and 405 and the heat transfer tube 66 interfere with each other. In this case, when the inner and outer sleeves 404 and 405 move in the radial direction and the longitudinal direction of the heat transfer tube 66 between two fixing sleeves 402 and 403, the movability thereof is amplified by an elastic force. For this reason, the vibration energy of the heat transfer tube 66 is dissipated by the vibration energy of the sleeves 404 and 405, that is, the heat transfer tube 66 and the sleeves 404 and 405 move in the reverse direction, the vibration energy of the heat transfer tube 66 and the vibration energy of the sleeve 102 are canceled with each other, and the vibration of the heat transfer tube 66 is absorbed and suppressed.

The vibration suppression device of the heat transfer tube of the fourth embodiment as described above is provided with the wire 101 that has flexibility and is disposed in the heat transfer tube 66, the inner sleeve 404 provided outside the wire 101 with the predetermined first gap S1, and the outer sleeve 405 provided outside the inner sleeve 404 with the predetermined fourth gap S4 and is disposed on the inner face of the heat transfer tube 66 with the second gap S2 d.

Accordingly, the sleeves 404 and 405 are movable with respect to the wire 101 in the radial direction and the longitudinal direction of the heat transfer tube 66, the sleeves 404 and 405 relatively move in the radial direction and the longitudinal direction of the heat transfer tube 66 when the heat transfer tube 66 vibrates, the sleeves 404 and 405 and the heat transfer tube 66 interfere with each other, the vibration energy of the heat transfer tube 66 is dissipated by the vibration energy of the sleeves 404 and 405, and thus it is possible to appropriately and effectively absorb and suppress the vibration of the heat transfer tube 66.

Fifth Embodiment

FIG. 15 is a cross-sectional view of a main component of the vibration suppression device of the heat transfer tube of a fifth embodiment of the invention. In addition, the same reference numerals and signs are given to the members having the same function as that of the embodiment described above, and the detailed description thereof is not repeated.

In the fifth embodiment, as illustrated in FIG. 15, a vibration suppression device 500 of a heat transfer tube is provided in an unusable heat transfer tube 66 in a steam generator 13 (see FIG. 8), and is to suppress vibration of a heat transfer tube 66 in which an end portion is closed at the plug 108 and inflow of the primary cooling water is obstructed, particularly, a U bend portion 68.

The vibration suppression device 500 has a wire 101 that has flexibility and is disposed in the heat transfer tube 66, and a plurality of sleeves 102 and 103 that are provided outside the wire 101 with a predetermined first gap S1 and is disposed on an inner face of the heat transfer tube 66 with predetermined second gaps S2 a and S2 b.

The wire 101 is provided with a plurality of assemblies 501 at a predetermined distance in a predetermined area. The sleeve assemblies 501 have the same configuration, a pair of fixing sleeves (positioning members) 502 and 503 are fixed to the wire 101 at a predetermined distance, and a plurality of (in the embodiment, four) sleeves 102 and 103 are movably disposed between the pair of fixing sleeves 502 and 503.

That is, the pair of fixing sleeves 502 and 503 have the cylindrical shape, is provided with insertion holes 504 and 505 through which the wire 101 is inserted and passes, the outer circumferential face of the wire 101 and the inner faces of the insertion holes 504 and 505 come in close contact with each other, and are fixed to the wire 101 by, for example, calking. The fixing sleeves 502 and 503 have a circular outer face, and the second gap S2 c is formed between the sleeve and the inner circumferential face of the heat transfer tube 66.

Two first sleeves 102 are disposed between the pair of positioning members 502 and 503, two second sleeves 103 are disposed between two first sleeves 102, and a predetermined third gap S3 (S3/2 are at two portions) is provided between the positioning members 502 and 503 and the sleeves 102 and 103 and between the sleeves 102 and 103. That is, the sleeves 102 and 103 are movably provided between the pair of positioning members 502 and 503 fixed to the wire 101 along the longitudinal direction of the wire 101 as much as the distance of the third gap S3.

In the vibration suppression device 500 of the fifth embodiment, with respect to the wire 101, the plurality of sleeves 102 and 103 are movable in the radial direction and the longitudinal direction (the axial core direction) of the heat transfer tube 66.

The vibration suppression device 500 is disposed in the unused heat transfer tube 66 in the steam generator 13 in the same manner as the first embodiment described above, and thus it is possible to suppress the vibration of the heat transfer tube 66. That is, when the heat transfer tube 66 vibrates, the sleeves 102 and 103 relatively move in the radial direction of the heat transfer tube 66 and move in the longitudinal direction, the sleeves 102 and 103 and the heat transfer tube 66 interfere with each other. For this reason, the vibration energy of the heat transfer tube 66 is dissipated by the vibration energy of the sleeves 102 and 103, that is, the heat transfer tube 66 and the sleeves 102 and 103 move in the reverse direction, the vibration energy of the heat transfer tube 66 and the vibration energy of the sleeves 102 and 103 are canceled with each other, and the vibration of the heat transfer tube 66 is absorbed and suppressed.

In the vibration suppression device of the heat transfer tube of the fifth embodiment as described above, the pair of fixing sleeves 502 and 503 are fixed to the wire 101 at a predetermined gap, and two kinds of sleeves 102 and 103 are movably disposed between the positioning members 502 and 503.

Accordingly, the sleeves 102 and 103 are movable relatively with respect to the heat transfer tube 66 in the radial direction and the longitudinal direction, the sleeves 102 and 103 move relatively with respect to the heat transfer tube 66 when the heat transfer tube 66 vibrates, and thus it is possible to effectively absorb and suppress the vibration of the heat transfer tube 66.

In addition, in the embodiment described above, it is described that the vibration suppression device of the heat transfer tube of the invention is disposed at the U bend portion of the reverse U-shape heat transfer tube, which is effective, but the sleeve is movable in the radial direction of the cord member, and thus it is possible to obtain substantially the same effect even when the same is applied to a linear portion. In addition, in the embodiment described above, the vibration suppression device of the heat transfer tube of the invention is applied to the heat transfer tube used in the steam generator of the pressurized water reactor (PWR), but the invention is not limited thereto, and it is possible to obtain substantially the same operational effect even when the same is applied to a general heat exchanger, which does not depend on the shape of the heat transfer tube.

REFERENCE SIGNS LIST

According to the embodiments, the sleeve is separated from the cord member with the first gap and is separated from the heat transfer tube with the second gap, and thus the heat transfer tube, the cord member, and the sleeve move relatively with respect to each other in a radial direction. For this reason, when the heat transfer tube vibrates, the cord member, each sleeve, and the transmission tube relatively move in the radial direction of the heat transfer tube, and the cord member and the sleeve interfere with each other. Thus, vibration energy of the heat transfer tube is dissipated by vibration energy of the sleeve, so that it is possible to effectively absorb and suppress the vibration of the heat transfer tube.

According to the embodiments, since the outer face of the sleeve has the spherical shape, even when the heat transfer tube is curved, it is possible to easily insert the plurality of sleeves when the sleeve is inserted into the heat transfer tube. Thus, the plurality of sleeves are appropriately inserted irrespective of the shape of the heat transfer tube, so that it is possible to improve workability. It is possible to form the sleeve only by processing a through-hole with respect to a spherical body, and thus it is possible to reduce a production cost.

According to the embodiments, the cord member is provided with two kinds of sleeves with different outer diameters, the first sleeve moves relatively with respect to the heat transfer tube as much as the second gap when the heat transfer tube vibrates. However, since the second sleeve further moves relatively with respect to the heat transfer tube as much as the large second gap from a position where the first sleeve comes in contact with the inner face of the heat transfer tube, the second sleeve drastically vibrates in the reverse direction with respect to the vibration of the heat transfer tube, so that it is possible to efficiently dissipate the vibration energy of the heat transfer tube.

According to the embodiments, since the first sleeve having the spherical shape is set with the diameter larger than that of the circular second sleeve, the second sleeve can move after the first sleeve moves and comes in contact with the inner face of the heat transfer tube when the heat transfer tube vibrates, so that it is possible to efficiently suppress the vibration of the heat transfer tube.

According to the embodiments, it is possible to efficiently move the first sleeve and the second sleeve with respect to the vibration of the heat transfer tube.

According to the embodiments, the sleeve is movable relatively with respect to the heat transfer tube in an axial core direction. For this reason, when the heat transfer tube vibrates, each sleeve relatively moves in the axial core direction of the heat transfer tube, so that the sleeve and the heat transfer tube interfere with each other. Thus, vibration energy of the heat transfer tube is dissipated by vibration energy of the sleeve, so that it is possible to effectively absorb and suppress the vibration of the heat transfer tube.

According to the embodiments, since a movement range of the sleeve is specified by the pair of positioning members, it is possible to specify the position of the sleeve with respect to the heat transfer tube, and thus it is possible to effectively dispose the sleeve in the vibration range of the heat transfer tube.

According to the embodiments, the sleeve is movable relatively with respect to the heat transfer tube as much as the third gap in the axial core direction, between the pair of positioning members. For this reason, when the heat transfer vibrates, the sleeve moves relatively with respect to the heat transfer tube as much as the third gap, and thus it is possible to effectively absorb and suppress the vibration of the heat transfer tube.

According to the embodiments, when the heat transfer tube vibrates, the sleeve moves relatively with respect to the heat transfer tube. In addition, in this case, movement thereof is promoted by elastic force of the biasing member, and thus it is possible to effectively absorb and suppress the vibration of the heat transfer tube.

According to the embodiments, since the sleeve is movable relatively with respect to the heat transfer tube in the radial direction and the axial core direction, the sleeve appropriately relatively moves irrespective of the vibration direction of the heat transfer tube, and thus it is possible to effectively absorb and suppress the vibration of the heat transfer tube.

According to the embodiments, it is possible to easily dispose the sleeve at a predetermined position in the heat transfer tube through the cord member by the towing portion, and it is possible to easily close the end portion of the heat transfer tube by the closure member, so that it is possible to improve workability.

According to the embodiments, it is possible to appropriately suppress the vibration of the U-shape portion of the heat transfer tube by the relative movement of the plurality of sleeves.

According to the embodiments, the high-pressure water as the primary cooling water flows into the plurality of heat transfer tubes, and the secondary cooling water flowing in the body portion is heated to generate steam, so that the heat transfer tube easily vibrates. In this case, when the heat transfer tube vibrates, the cord member and each sleeve relatively move with respect to each other in the radial direction of the heat transfer tube, so that the cord member, the sleeve, and the heat transfer tube interfere with each other. Thus, vibration energy of the heat transfer tube is dissipated by vibration energy of the cord member and the sleeve, so that it is possible to effectively absorb and suppress the vibration of the heat transfer tube.

According to the vibration suppression device of the heat transfer tube and the steam generator of the invention, since the cord member having flexibility and the plurality of sleeves that are provided outside the cord member with the first gap and are disposed on the inner face of the heat transfer tube with the second gap are provided, the cord member and the sleeves move relatively with respect to the heat transfer tube, and thus it is possible to appropriately and effectively absorb and suppress the vibration of the heat transfer tube. 

1. A vibration suppression device of a heat transfer tube comprising: a cord member that has flexibility and is disposed in a heat transfer tube; and a plurality of sleeves that are mounted outside the cord member with a predetermined first gap and are disposed on an inner face of the heat transfer tube with a predetermined second gap.
 2. The vibration suppression device of a heat transfer tube according to claim 1, wherein the sleeve has a spherical outer face.
 3. The vibration suppression device of a heat transfer tube according to claim 1, wherein the sleeve has a first sleeve and a second sleeve with different outer diameters.
 4. The vibration suppression device of a heat transfer tube according to claim 3, wherein the first sleeve has a spherical outer face, the second sleeve has a circular outer face, and the outer diameter of the first sleeve is set larger than the outer diameter of the second sleeve.
 5. The vibration suppression device of a heat transfer tube according to claim 4, wherein the second sleeve is disposed between the plurality of first sleeves.
 6. The vibration suppression device of a heat transfer tube according to claim 1, wherein the plurality of sleeves are mounted movably in a longitudinal direction of the cord member with respect to the cord member and in a radial direction of the cord member.
 7. The vibration suppression device of a heat transfer tube according to claim 6, wherein a pair of positioning members are fixed to the cord member with a predetermined gap, and the sleeve is movably disposed between the pair of positioning members.
 8. The vibration suppression device of a heat transfer tube according to claim 7, wherein a predetermined third gap is provided between the positioning member and the sleeve or between the plurality of sleeves.
 9. The vibration suppression device of a heat transfer tube according to claim 7, wherein a biasing member is interposed between the positioning member and the sleeve or between the plurality of sleeves.
 10. The vibration suppression device of a heat transfer tube according to claim 1, wherein the plurality of sleeves include an inner sleeve that is mounted outside the cord member with the first gap, and an outer sleeve that is mounted outside the inner sleeve with a predetermined fourth gap and is disposed on an inner face of the heat transfer tube with the second gap.
 11. The vibration suppression device of a heat transfer tube according to claim 1, wherein the cord member has a leading end portion that is connected to a towing portion and a trailing end portion that is connectable to a closure member closing an end portion of the heat transfer tube.
 12. The vibration suppression device of a heat transfer tube according to claim 1, wherein the heat transfer tube has a U-shape portion, and the plurality of sleeves are disposed at the U-shape portion.
 13. A steam generator, which is provided with the vibration suppression device of the heat transfer tube according to claim 1, comprising: a body portion that has a hollow airtight shape; a heat transfer tube group that is provided to form a reverse U-shape in the body portion and is formed of a plurality of heat transfer tubes in which first cooling water flows; a tube plate that is fixed to a lower portion in the body portion and supports end portions of the plurality of heat transfer tubes; an inlet side channel head and an outlet side channel head that are provided at a lower end portion of the body portion and communicate with each end portion of the plurality of heat transfer tubes; a water supply portion that supplies secondary cooling water into the body portion; and a steam outlet that is provided at an upper end portion of the body portion. 